gdb fixes

examples/src/cuda_example.cu

@@ -33,7 +33,7 @@ __device__ void foo()
 #ifdef NOHANG
    for (i = 0; i <= 1000000; i++)
 #else
-   for (i = 0; i >=0; i++)
+   for (i = 0; i >= 0; i++)
 #endif
    {
     x = i;
@@ -70,15 +70,18 @@ void add2(int *a, int *b)
 int main(int argc, char **argv)
 {
     int ha[N], hb[N], hc[N];
+    char hostname[256];
+    gethostname(hostname, 256);
 #ifdef USEMPI
     int numtasks, rank;
-    char hostname[256];
     MPI_Init(&argc,&argv);
     MPI_Comm_size(MPI_COMM_WORLD, &numtasks);
     MPI_Comm_rank(MPI_COMM_WORLD, &rank);
-    gethostname(hostname, 256);
     printf("Hello world from %s %d/%d\n", hostname, rank, numtasks);
+#else
+    printf("Hello serial world from %s\n", hostname);
 #endif
+    fflush(stdout);
     int *da, *db;
     cudaMalloc((void **)&da, N*sizeof(int));
     cudaMalloc((void **)&db, N*sizeof(int));

scripts/gdb.py

@@ -30,6 +30,7 @@
 import signal
 import os
 import logging
+import time
 from datetime import datetime
 
 def init_logging(input_loglevel, input_logfile):
@@ -115,6 +116,7 @@ def readlines(self, breakstring=None):
         line = ''
         lines = []
         while True:
+            time.sleep(.00001) # the poll sometimes would hang in the absence of a short sleep
             ret = self.subprocess.poll()
             if ret != None:
                 error_msg = 'Subprocess terminated with ret code %d\n' %(ret)

scripts/stat_cuda_gdb.py

@@ -47,7 +47,7 @@ def new_gdb_instance(pid, gdb_type='gdb'):
     #    (cudbgApiAttach) will be abandoned.
     #    When the function is done executing, GDB will silently stop.
     if "TMPDIR" not in os.environ:
-        os.environ["TMPDIR"]="/var/tmp/%s" %(pwd.getpwuid( os.getuid() ).pw_name)
+        os.environ["TMPDIR"]="/var/tmp"
 
     try:
         if 'cuda-gdb' in os.environ['STAT_GDB']: